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Go
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import ( "encoding/json" "fmt" "math" "strings")
type ImageMimeType string
const ( ImagePNG ImageMimeType = "image/png" ImageJPEG ImageMimeType = "image/jpeg" ImageWEBP ImageMimeType = "image/webp")
type ImageMetadata struct { MimeType ImageMimeType `json:"mimeType"` Width int `json:"width"` Height int `json:"height"` Bytes int `json:"bytes"`}
type ImageAttachment struct { ImageMetadata Data string `json:"data"`}
var validMimeTypes = map[ImageMimeType]bool{ ImagePNG: true, ImageJPEG: true, ImageWEBP: true,}
// ParseImageMetadata validates raw image metadata fields and returns nil if invalid.func ParseImageMetadata(val any) *ImageMetadata { if val == nil { return nil }
data, err := json.Marshal(val) if err != nil { return nil }
var meta ImageMetadata if err := json.Unmarshal(data, &meta); err != nil { return nil }
if !validMimeTypes[meta.MimeType] { return nil }
if meta.Width < 1 || meta.Width > 16384 { return nil } if meta.Height < 1 || meta.Height > 16384 { return nil } if int64(meta.Width)*int64(meta.Height) > 40_000_000 { return nil } if meta.Bytes < 1 || meta.Bytes > 5*1024*1024 { return nil }
return &meta}
// ImageLabel returns human-readable label for image metadata.func ImageLabel(meta ImageMetadata) string { var size string if meta.Bytes >= 1024*1024 { size = fmt.Sprintf("%.1f MB", float64(meta.Bytes)/1024.0/1024.0) } else if meta.Bytes >= 1024 { size = fmt.Sprintf("%d KB", int(math.Ceil(float64(meta.Bytes)/1024.0))) } else { size = fmt.Sprintf("%d B", meta.Bytes) }
prefix := "" if strings.HasPrefix(string(meta.MimeType), "image/") { prefix = strings.ToUpper(string(meta.MimeType)[6:]) } else { prefix = strings.ToUpper(string(meta.MimeType)) }
return fmt.Sprintf("%s %d×%d · %s", prefix, meta.Width, meta.Height, size)}